import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.imageio.ImageIO;

import jp.sourceforge.qrcode.QRCodeDecoder;
import jp.sourceforge.qrcode.data.QRCodeImage;
import jp.sourceforge.qrcode.exception.DecodingFailedException;

import com.swetake.util.Qrcode;

public class QRCodeHandler {

	public static void main(String[] args) throws Exception {

		//QRCodeEncoderTest();
		QRCodeDecoderTest();
	}

	/**
	 * 生成二维码
	 * @throws Exception
	 */
	public static void QRCodeEncoderTest() throws Exception {
		Qrcode qrcode = new Qrcode();
		qrcode.setQrcodeErrorCorrect('M');
		qrcode.setQrcodeEncodeMode('B');
		qrcode.setQrcodeVersion(7);

		String testString = "我是中国人";

		byte[] d = testString.getBytes("GBK");

		BufferedImage bi = new BufferedImage(139, 139,
				BufferedImage.TYPE_INT_RGB);

		// createGraphics
		Graphics2D g = bi.createGraphics();

		// set background
		g.setBackground(Color.WHITE);
		g.clearRect(0, 0, 139, 139);

		g.setColor(Color.BLACK);

		if (d.length > 0 && d.length < 123) {
			boolean[][] b = qrcode.calQrcode(d);

			for (int i = 0; i < b.length; i++) {

				for (int j = 0; j < b.length; j++) {
					if (b[j][i]) {
						g.fillRect(j * 3 + 2, i * 3 + 2, 3, 3);
					}
				}

			}
		}

		g.dispose();
		bi.flush();

		String FilePath = "TestQRCode.png";
		File f = new File(FilePath);

		ImageIO.write(bi, "png", f);
		System.out.println("doned!");
	}

	/**
	 * 解析二维码
	 * @throws Exception
	 */
	public static void QRCodeDecoderTest() {

		QRCodeDecoder decoder = new QRCodeDecoder();
		File imageFile = new File("TestQRCode.png");
		BufferedImage image = null;
		try {
			image = ImageIO.read(imageFile);
		} catch (IOException e) {
			System.out.println("Error: " + e.getMessage());
		}
		try {

			String decodedData = new String(
					decoder.decode(new J2SEImage(image)), "GBK");

			System.out.println(decodedData);
		} catch (DecodingFailedException dfe) {
			System.out.println("Error: " + dfe.getMessage());
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
	}
}

class J2SEImage implements QRCodeImage {
	BufferedImage image;

	public J2SEImage(BufferedImage image) {
		this.image = image;
	}

	public int getWidth() {
		return image.getWidth();
	}

	public int getHeight() {
		return image.getHeight();
	}

	public int getPixel(int x, int y) {
		return image.getRGB(x, y);
	}

}